Mechanical stoker.



VJEATENTED Nov. s, 190s.

E.V F. EDGAR. MECHANICAL sToKBR.

APPLICATION FILED MAY 7, 1903- No MODEL.

inch in height.

vUMTED STATES' Patented November 3, 1903.

ELLIS EDGAR, OF WOODBRIDGE, JERSEY.

MECHANICAL STOKER.

SPECIFICATION forming part of Letters Patent No. 742,975, dated November3, 1903.

Application led May '7, 190,3. Serial No. 155,975. (No model-l To a/ZZwhom it may concern:

Be it known that I, ELLIs F. EDGAR, a citizen of the United States, anda resident of Woodbridge, in the `county of Middlesex and State of NewJersey, have invented certain new and useful Improvements in MechanicalStokers, of which the following is a specification.

Figure 1 is a sectional side elevation view. Fig. 2 is an end elevation,part in full and part with two end guide plates removed. Fig. 3 isafront elevation view in perspective at lines @c in Fig. 2, part in fulland part with grate-bars removed.

My invention relates to a grate-bar for burning ne coal,'here shownmounted on an endless chain composed of links, for use in a rnechanicalStoker of the traveling-grate type.

1 represents links for supporting and carrying grate-bars; 2, axles forsupporting and carrying links 1; 3, Wheels for supporting and carryingaxles 2; 12, second vsprocketwheel for carrying around thetravelinggratebar sections; 13, rst sprocket-wheel for carrying aroundthe traveling grate-bar sections; 14, side of stoker; 15, tracksupporting the traveling grate-bar sections between the saidsprocket-wheels; 4, end guide-plates mounted on and secured to links 1for supporting grate-bars; 5, center guide-plates mounted on and securedto links 1 for supporting grate-bars; 6, lower grate-bar; -7, secondgrate-bar; 8, third grate-bar; 9, fourth or upper grate-bar; 10,projection from back of grate-bar 9, overlapping the end of grate-bar 6to prevent the fine coal from falling through at this point; 11,beadingto prevent the coal from working back and falling down theairspace between the grate-bars; 17, the driving-rod, connected toadjustable slot 18 for operating feed-plunger 16; 19, feed-hopper forreceiving the coal; 20, stationary grate at the end of traveling grate.

These grate-bars are made about one-halfV inch in thickness, with asurface on the top of about two inches wide by twelve inches long andthe height of the bar from the carryinglinks, commencing at grate-bar 6,about one The top of grate-bar 9 will be about four inches in heightfrom carryinglinks 1 and are made to be easily removed, y

from guide-plates 4 and 5, if necessary from either burning or warping.

It can readily be seen that a grate constructed in this manner whencovered with fine coal the coal will drop down in the pockets betweengrate-bar 9 in the forward section on the top of grate-bar 6 and onprojection 10 and on part of grate-bars 7 and 8, and the air enteringthe field of combustion must necessarily rise .between grate-bars 6 and7, 7 and 8,and 8 and 9 through said pocket,

providing for an opportunity for a larger air- Y openin g than in usualforms of, grate-bar constructions for fine coal.

Operation: In starting the ire in the form here shown applied to amechanical stoker the fireman would enter the furnace-door opening atthe backV end of the traveling grate or over the stationary grate, placefine kindling-wood in the aforesaid pockets of several ofv the grate barsections to the height of two or three inches above top of grate-bar 9of the front sections lying next to the feed-hopper, then cover `withseveral inches of fine coal, light the same, and after the coal becomesincandescent start the stoker in operation, and as the grate begins tomove the incandescent coal on the rear of the top of grate bar 9 willfallin the pocket of the next section as the grate-bar sections comefrom under the oor supporting plunger 16, and the length of stroke andspeed of plunger 16 can be so regulated that this process of ignitedcoal falling into these pockets and sufficient coal over top of gratebar9 may be continuous,burning much more iine coal 'per square foot ofgrate area with less chimney-draft than has heretofore beenaccomplished.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is

1. In a fuel-burning grate, the combination of a plurality ofgrate-sections, each of said sections comprising a plurality ofright-angled grate-bars, said grate-bars forming steps with air-passagesbetween, providing fuelpockets between the fronts of said steps and thehighest bar of the next section, said airpassages leading into saidfuel-pockets.

2. In a fuel-burning grate, the combination luv of a plurality ofgrate-sections, each of said links secured together by a series ofaxles,

sections comprising a plurality of angled Wheels for supporting saidaxles, a plurality grate-bars spaced from one another forming of gratesections carried by said endless air-passages, said sections forming fuel-pockchain, each of said sections comprising a'pluets into which theair-passages lead. rality of angled grate-bars spaced from one zo 3. Ina fuel-burning grate the combination another forming air passages, thesections of an endless chain of links, a plurality of formingfuel-pockets into which said air-pasgrate-sections carried thereby, eachof said sages lead. l

sections comprising a plurality of angled Signed at New York, in thecounty of New 1o grate-bars spaced from one another forming York andState of New York, this 6th day of 2 5 air-passages, said sections beingso arranged May, A. D. 1903.

as to form fuel-pockets into which said air- ELLIS F. EDGAR. passageslead. Witnesses: 4

4. In a fuel-burning grate the combination W. G. FRANZ,

I5 of an endless chain comprising a series of C. B. GLICK.

